Saw attachment for electric drills



Feb.21,1933. w EHARVIE 1,898,956

SAW ATTACHMENT FOR ELECTRIC DRILLS Filed March 22, 1932 3 Sheets-Sheet l Wali'erfyzdrcggeflarre INVENTOR ATTORNEYS Feb. 21, 1933. w HARVlE 1,898,956

SAW ATTACHMENT FOR ELECTRIC DRILLS Filed March 22, '1932 5 Sheets-Sheet 2 y 33 mrzmiq eflan/ze ATTORNEYS Feb. 21, 1933. w E HARVlE 1,898,956

SAW ATTACHMENT FOR ELECTRIC DRILLS Filed March 22, 1932 3 Sheets-Sheet 3 INVENTOR ATTORNEYS Patented Feb 215 g I UNITED STATES PATENT OFFICE WALTER ELDRIDGE HARVIE, OF PORTLAND, MAINE SAW ATTACHMENT FOR ELECTRIC DRILLS Application filed March 22, 1932. Serial No. 600,504.

The invention relates to a combination scribed in detail, illustrated in the accomtool and more especially to a saw attachpanying drawings, which disclose the prement for an electric drill. fer-red embodiment of the invention, and

The primary object of the invention is the pointed out in the claim hereunto appended.

provision of an attachment of this character, In the accompanying drawings 55 wherein the drill, which is of the electric Figure 1 is a side elevation of a chuck type, can be utilized for drilling, inortising drill showing the saw attachment constructor other purposes and in its association with ed in accordance with the invention applied the attachment the latter can be utilized for thereto and the same being in section.

various purposes, such as a hack saw, cut- Figure 2 is an elevation of the attachment ting off or splitting saw, or to take the removed from the drill and the same being place of a band saw, scroll saw and filing partly in section. or other purposes, the attachment being of Figure 3 is a vertical longitudinal sectional novel form so that it may be set for use upon view through the attachment.

a bench or support or the tool in its entlrety Figure 4. is a sectional view on the line 65 can be rendered portable for its use when 4-4 of Figure 3.

held in the hand of an operator. Figure 5 is a sectional view on the line Another object of the invention is the pro- 5-5 of Figure 2.

vision of an attachment of this character, Figure 6 is a perspective view of the rewherein the drill may be converted so ciprocating rack plunger for the saw.

that the same is susceptible for drilling or Figure 7 is an elevation of a file coupling sawing purposes and is useful for both wood for the saw attachment.

and metal work by carpenters, boiler mak- Figure 8 is a view similar to Figure 7 ers, structural steel workers, blacksmiths, looking at right angles thereto.

machinists, ship fitters and builders, elec- Figure 9 is a perspective view of the gauge 76 tricians, plumbers and steam fitters, andfacof the saw attachment. tory maintenance shops, or by artisans either Figure 10 is a bottom plan view thereof. of skilled or non-skilled grade. Figure 11 is an elevation of a stand and A. further object of the invention is the supporting bracket for the drill and saw provision of an attachment of this charattachment. acter, wherein the construction thereof is Figure 12 is an elevation of a slight modinovel in form and is readily mountable upon fied form of stand. and demountable from an electric drill or Similar reference characters indicate corother hand or power operated kind, the atresponding parts throughout the several tachment when upon the drill serving as a views in the drawings.

unit therewith and permitting the convert- Referring to the drawings in detail, A ing of the latter for the execution of dliferdesignates generally an electric drill, the ent kinds of work. motor for driving such drill being of the ro A still further object of the invention is tary type (not shown). The casing of the the provision of an attachment of this chardrill A is formed with a handle B in which acter which is comparatively simple in conis fitted a grip trigger C, the latter consti struction, thoroughly reliable and efiicient tuting the control for the electric switch for in its operation, strong, durable, readily and closing the circuit to the motor of said drill easily mounted and demounted from a drill and this trigger C is manually operated in and operable from its power motor and also the usual well known manner. The motor inexpensive to manufacture. has its power shaft 10 projected exteriorly With these and other objects in view, the of the casing of the drill A and with this invention consists in the features of conowcr shaft is connected the saw attachment struction, combination and arrangement of ereinafter fully described and constituting parts as will be hereinafter more fully dethe present invention.

The saw attachment comprises a housing or casing 11 having a closed-end 12 and an opposite open end 13, the latter bein adapted to receive and embrace a portion of t e casing of the drill A in the mounting of the attachment thereon. The closed end 12 of the housing or casing 11 is formed with a hearing 14 in which is journaled a stud spindle 15, the same at its inner end formed with a coupling 16 for the shaft 10 of the motor of the drill A, the coupling 16 being of the detachable kind. The outer end of the stud spindle 15 has detachably fitted therewith a drill chuck 17 of any standard type.

At one side of the housing or casing 11 is an enlargement 18 having formed centrally therein a guideway 19 for a reciprocatory rack plunger 20, the latter formed with toothed racks 21 at opposite sides thereof and this plunger 20 is furcated at 22 for the detachable mounting therein of a saw blade 23, the furcation being at the outer end of the plunger. It is of course understood that the saw blades 23 can be of any type such as a hack saw, scroll or any form of cutting toothed saw.

Formed at opposite sides of the guideway 19 are recesses 24 in which are journaled mutilated toothed gears 25, the teeth 26 of which alternately mesh with the rack teeth 21 of the plunger 20 so as to reciprocate the latter within the guideway 19 in the operation of the tool.

The ears 25, through the medium of a train 0% gears 27 including the companion beveled meshing gears 28, are driven from the spindle 15 which when coupled with the shaft 10 transmits power from the motor of the drill A to the plunger 20 for the operation of the same. The motor of the drill A is started and stopped by manually operating the trigger C for controlling the switch of the circuit to the said motor.

The enlargement 18 has secured at its upper end a split ring-like clamp 29 which is adapted to embrace the body of the drill A and through a fastener 30 is detachably secured so that in this manner the saw attachment is made fast to the drill A as will be clearly obvious.

At the closed end 12 of the housing or casing 11 concentrically of the spindle 15 pro- 'ected therethrough is a detachable guide 31 aving an adjustable gauge 32 provided with a centering pin 33 and this guide is usable with the attachment when cutting circular work, the saw 23 being adapted to play through a throat 34 in said guide 31 and the under face of this guide carries bearing rollers 35 for engagement with the work during scroll sawing operation of the attachment or in cutting circular work, it being understood of course that the chuck 17 is removed from the spindle 15 when this character of work is being performed. The

Leeann holder 38 for a file 39 and this holder is adapted for detachable connection in the furcation 22 in substitute for the saw 23 so that the attachment can be used for filing purposes.

In F igune 11 of the drawings there is shown a supporting stand 40 having a vertical post 41 carrying an adjustable bracket 42 provided with a hinged clamp 43 for embracing the drill A so that the lat-ter with the attachment can be utilized as a hack saw for cutting either steel or wood material, the material being held by a clamp 44 upon the stand 40.

In Figure 12 of the drawings there is shown a stand 45 having a post 46 carrying an adjustable bracket 47 in which the drill A is clamped through the medium of the clamp 48, while beneath the work bed 49 of this stand 45 and attached thereto is a coiled retractile spring 50, the same being detachably cou led at 51 with the saw blade 52 of the attac ment. Thus it will'be seen that in this mounting the tool can be used as a cuttin off or splitting saw, the spring being designed to hold the saw 52 taut and the latter operates within a suitable guide 53 upon the bed 49 of the stand 45. In this mounting should the motor be turned clockwise approximately ninety degrees the saw would then be in position to take the place of a band saw and also function as a splitting saw.

It is of course to be understood that the train of gears 27 including the companion beveled meshing gears 28 can be varied in size with respect to each other to increase or decrease the speed of operation of the device.

Mounted in the guideway 19 at the inner end thereof is a spring 54 which functions as a cushioning elementin the operation of the device.

The rollers 35 are dis osed to travel in one directim while a supp emental roller 55 is carried by the guide 31 and this roller is swiveled so that the device can be revolved for use in scroll saw work or the same may be oscillative in the working thereof.

The drill A and the saw attachment as heretofore described is serviceable for many uses for wood working or metal working.

The saw attachment is readily removable from the drill A and the latter can be handled and operated in the usual well known manner as a single unit.

What is claimed is The combination with a power mechanism having a housin with a motor provided with a driving s aft, of a casing open at one end and telescopically engaged at its open end with said housing, a clamp carried by the casing and embracing the housing for detachably uniting said casing and housing, an enlargement formed longitudinally of the casing and having a central guideway, a reciprocating rack p unger fitted in said guideway and having toothed racks at opposite sides, the plunger being formed with a furcated outer end, a tool detachably seated in said furcated end, and driven connections between the toothed racks and the driving shaft for the continuous reciprocation of the plunger.

In testimony whereof I afiix my signature.

WALTER E. HARVIE. 

